SB2026071041 - Multiple vulnerabilities in CoreDNS
Published: July 10, 2026 Updated: July 13, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) NULL pointer dereference (CVE-ID: N/A)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error within 28-byte UDP datagram when the proxyproto plugin is enabled. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.
2) Uncaught Exception (CVE-ID: N/A)
CWE-ID: CWE-248 - Uncaught Exception
CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to uncaught exception within k8s_external. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.
3) NULL pointer dereference (CVE-ID: N/A)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a null pointer dereference in the rewrite plugin edns0 response-revert rules when processing a downstream response with no OPT record after a matching edns0 rewrite rule with the revert flag enabled. A remote attacker can send a DNS query that triggers the queued response rule to cause a denial of service.
If the debug directive is enabled, the panic is not recovered and the issue can crash the entire CoreDNS process.
Remediation
Install update from vendor's website.